Silvia Club of NSW

nice response for my other post, so here's a question that's been on my mind for a while.

My diff (helical on the manual) is getting the clunks, and although it still does the business it's getting annoying and I expect it will start to affect the handling sooner or later.

The replacement options as I see it, are

1) another stocker. expected aging would be the same in that case.

2) Nismo does a 1.5/2 (adjustable) that seems to have a rep for being solid, but I don't know if the clutch-pack behaviour would feel and be poorer on the road where I spend all my time.

3) Quaiffe manufacturing in England do a helical that's said to be stronger, and fits the S13 and S14 but they give no clues about the S15 since it wasn't sold in the UK or US. From what's known about the S14 and S15, are the diff packs totally interchangable?

Also I can't find an aussie supplier, apart from one place that deals with the Quaiffes mostly for Escorts and such. Anyone know a local or aussie supplier that can clue me in properly?

4) any other manufacturers out there? Trust? HKS? I want strictly road quality handling, not got the time or resources to go track-racing or drifting comps.

most mechanical diffs will give so some form of skipping/clunking when oing u turns ect

there are quite a few brands eg nismo, cusco, kaaz, tomei ect

from memory nismo are the quiteset

but if the car is purly a street car thses will most likly be over kill and more annoying then anything


maybe stock replacement would be the best bet

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speak to wing or QIK513, they both had a S15 standard lsd for sale.

Yeah, from brand new there was a clunk when loading up reverse, but in the last year or so it's clunked when lightly loading up first - like in peak-hour it'll clunk a lot.

For at least a year now, it's been clunking sometimes when coming off load to stop, (clutch in) and the most recent thing for about 6 months is a quiet little ticca-ticca-ticca as I roll to a stop, and that's when free-wheeling in neutral so there's no load.



thanks, good to know if someone tries to sell me on it. The worst thing I want is cranky two-way behaviour, 'cos on the road and in the wet you definitely need to be able to back off suddenly and reliably, give-or-take a catch of oversteer or whatever.



yeah, but I'd still be looking at the same life expectancy then. This is why I thought the quaiffe would be good if if really was stronger. I'd get the same good manners of the helical. It's really smooth and reliable to engauge - nothing stupid happens when the slidey stuff starts.

What do you mean exactly?

Just annoying with clunks, or some bad/risky behaviour

and would they just be way over-specced and over price for standard engine? I am feeling the need to take the power out at least to the 200 mark, just whatever I can get from the usual shit like exhaust, intercooler and hairdryer...

A 2-way diff means that even under deceleration, the wheels wheel both rotate the same aount and at the same time - ie. they have little/no slip at all.

This means that cornering (in the wet) can be more risky, shenanigans in car parks, and really should only be considered if you are building a pretty hardcore car.

A 1.5 way would be the better option, but it will be more noisy than the stock diff.

By the way, I think you could do a lot worse than spend your money on other mods before the diff.

yes a 2 way will churp the tyres in car parks

will nearly allways be locking up,

make your car have quite a tailhappy properties


and seeing you car is ONLY a street car, and you dont like you stock diff because it is making noises, the advantages are pretty much nill as you wont be using the diff to its full potentioal,

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Noise is not such a big deal as long as it's not a sign of imminent destruction. The 1.5's go open if you back off the power, is that correct? That sounds like it should be safer for sudden lift-off.

From what i've read, the 2 ways like clutchpacks lock up and then you don't get differential action (ie different wheel speeds) so you stress one wheel and can lose traction. Great for drifting. The helicals are good 'cos they keep a seamless spread of power from side to side while still allowing differential wheel speeds. Hence they are less likely to trigger a wheel breaking traction on a corner due to locking. Correct?

Anyway, the 1.5 AND the 2.0 lock solid under power, but the 1.5 releases lock when you back off the power, the 2.0 stay locked when you back off the power. So ...... even 1.5 will compromise your handling a bit on the street where safety is more important than a guaranteed slied.

So if I've got all that right, it's the reason I wish to stay with a helical but hopefully a stronger one.

took to long to reply; you've covered the ground mostly.

I wanted to say also, I don't like the clunks because I think they're signs of wear that maybe needs to be addressed. I can't say I feel any bad behaviour yet, so what I need to know instead of spending money is how long a clunkly helical will still stay usable.

As you say, if a clunky diff is no big deal, then shit-yeah I should spend my money on something more useful.

nope, thats a 1 way. 1.5 way still wants to lock on decel but you get some slip as opposed to no slip

plus there's always friction modifier in the diff oil to soften it up if it's too harsh for you, or a nismo pro lsd which has adjustable preload.

Sorry it doesn't answer your original question though.

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meh

Just get a KAAZ 1.5 way, easy to find in aus.

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Disclaimer: If you have'nt worked it out by now I CANT SPELL FOR SHIT.

that's all good. Clearing up the partial lock effect of the 1.5 vs. 1.0 is good to know.

About the KAAZ 1.5, how's it behave on the road? will i have to relearn my slides and catches?

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I like my coffee how I like my women: cold, pale, weak and bitter.

If you are worried about it being safer for suden lift-off, then maybe you should relearn your slides and catches

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-- JOC --

only going on hear-say. There's a reason people and manufacturers don't use track configs for road. Like it or not I gotta admit i'm not going to be on any track due to lack of time. Anyone that doesn't consider safety on the road is a dickhead imho. You have to plan for disaster and know what sort of margin and handling you need for avoidance in the worst circumstance.

as for knowing what a harder diff will feel like, I haven't experienced it so that's why I'm asking for opinions.

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I like my coffee how I like my women: cold, pale, weak and bitter.

a nismo 1.5way lsd is perfectly streetable. the lockup on decel isn't so harsh that you'll step it sideways in an emergency from lifting off alone.
especially if you set the preload on the lowest setting.

having a proper diff in the back of these cars totally transforms them. you can drive it on the throttle when pushing hard,and when commuting you'll only notice it when parking as it'll clunk some on very tight turns.
otherwise,it's almost like factory around town. start to push though,and you'll have better control than before through the corners,and better traction out of corners.


Justin...

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STI - Made in Texas,not Japan.